Role of Strong Electronic Correlations in the Metal-To-Insulator Transition in Disordered LiAlyTi2yO4

F. Fazileh, R. J. Gooding, W. A. Atkinson, and D. C. Johnston
Phys. Rev. Lett. 96, 046410 – Published 3 February 2006

Abstract

The compound LiAlyTi2yO4 undergoes a metal-to-insulator transition for yc0.33. It is known that disorder alone is insufficient to explain this transition; e.g., a quantum site percolation model predicts yc0.8. We have included (Hubbard) electronic interactions into a model of this compound, using a real-space Hartree-Fock approach that achieves self-consistency at every site, and have found that for a Hubbard energy equal to 1.5 times the non-interacting bandwidth one obtains yc0.3. Further, with increasing Hubbard energy we find an Altshuler-Aronov suppression of the density of states, δN(ϵ)|ϵϵF|, that reduces the density of states at the Fermi energy to zero at the critical Hubbard interaction. Using this ratio of correlation to hopping energy one is led to a prediction of the near-neighbor superexchange (J/t1/3) which is similar to that for the cuprate superconductors.

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  • Received 15 November 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.046410

©2006 American Physical Society

Authors & Affiliations

F. Fazileh* and R. J. Gooding

  • Department of Physics, Queen’s University, Kingston, Ontario K7L 3N6, Canada

W. A. Atkinson

  • Department of Physics, Trent University, Peterborough, Ontario K9J 7B8, Canada

D. C. Johnston

  • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames Iowa 50011, USA

  • *Present address: Department of Physics, University of Windsor, Windsor ON N9B 3P4, Canada.

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Vol. 96, Iss. 4 — 3 February 2006

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